Answers for "assert python 3"

python assert

"""Quick note!
This code snippet has been copied by Pseudo Balls.
This is the original answer.
Please consider justice by ignoring his answer.
"""
"""assert:
evaluates an expression and raises AssertionError
if expression returns False
"""
assert 1 == 1  # does not raise an error
assert False  # raises AssertionError
# gives an error with a message as provided in the second argument
assert 1 + 1 == 3, "1 + 1 does not equal 3"
"""When line 7 is run:
AssertionError: 1 + 1 does not equal 3
"""

assert syntax python

assert <condition>,<error message>
#The assert condition must always be True, else it will stop execution and return the error message in the second argument
assert 1==2 , "Not True" #returns 'Not True' as Assertion Error.

assert python

x = "hello"

#if condition returns False, AssertionError is raised:
assert x == "goodbye", "x should be 'hello'"
-----------------------------------------------------------------
Traceback (most recent call last):
  File "demo_ref_keyword_assert2.py", line 4, in <module>
    assert x == "goodbye", "x should be 'hello'"
AssertionError: x should be 'hello'

python assert statement

name = 'quaid'
# check if name assigned is what assert expects else raise exception
assert(name == 'sam'), f'name is {name}, it should be sam'

print("Hello {check_name}".format(check_name = name))
#output: Assertion Error 
# quaid is not what assert expects rather it expects sam as a string assigned to name variable
# No print out is received

python assert

def input_age(age):
   try:
       assert int(age) > 18
   except ValueError:
       return 'ValueError: Cannot convert into int'
   else:
       return 'Age is saved successfully'
 
print(input_age('23'))  	# This will print
print(input_age(25))  		# This will print
print(input_age('nothing')) # This will raise ValueError which is handled
print(input_age('18'))  	# This will raise AssertionError, program collapses
print(input_age(43))  		# This won't print

assert python 3

# Simple asserting thing, run it by using pytest or something 
# If you don't know how to run pytest, then go learn it.

def test_math():
    assert(1 + 1 == 2)

# Another way to test it (without pytest) is:
# You could just run the function to see if it makes an error.
# If it doesn't, it means it was fine, if it does, it means there's an error.

# But then again, using pytest or something is much easier and saves time.
# So try to use testing applications instead of running the function to see.